I used this for JSON last time I wrote any C++ a few years ago and it still seems popular. It seemed sane enough to me.
Overview: https://www.boost.org/doc/libs/1_84_0/libs/json/doc/html/jso...
Benchmarks: https://www.boost.org/doc/libs/1_84_0/libs/json/doc/html/jso...
Parsing Options for non-standard JSON: https://www.boost.org/doc/libs/1_84_0/libs/json/doc/html/jso...
Overview: https://www.boost.org/doc/libs/1_84_0/libs/json/doc/html/jso...
Benchmarks: https://www.boost.org/doc/libs/1_84_0/libs/json/doc/html/jso...
Parsing Options for non-standard JSON: https://www.boost.org/doc/libs/1_84_0/libs/json/doc/html/jso...